Track errors in symfony when testing with phpunit when using WebTestCase

TestCase1.php

public function testSmth() {
  $this->client = static::createClient();
  $crawler = $this->client->request('GET', '/my-test-page');
  if ($this->client->getResponse()->getStatusCode() !== 200) {
    dump($crawler->filter('.text-exception')->first()->text());
	  dump($crawler->filter('.traces > li')->eq(0)->text());
	  dump($crawler->filter('.traces > li')->eq(1)->text());
    throw new \Exception('Request to /my-test-page was not successfull');
}

TestCase2.php

public function testSmth() {
  $this->client = static::createClient();
  $crawler = $this->client->request('GET', '/my-test-page');
  if ($this->client->getResponse()->getStatusCode() !== 200) {
    $profile = $this->client->getProfile();
    $exceptionProfile = $profile->getCollector('exception');
    $trace = $exceptionProfile->getTrace();
    $trace = array_slice($trace, 0, 5);
    $trace = array_map(function($i) {
      unset($i['short_class']);
      unset($i['namespace']);
      if ($i['file']) {
        $root = $this->container->getParameter('kernel.root_dir');
        $root = str_replace('app', '', $root);
        $i['file'] = str_replace($root, '', $i['file']);
        unset($i['class']);
        $i['file'] .= $i['type'] . $i['function'] . ':' . $i['line'];
        unset($i['line']);
        unset($i['type']);
        unset($i['function']);
      }
      return $i;
    }, $trace);
   dump($trace);
   throw new \Exception($exceptionProfile->getMessage());
}